Soap Bubbles
and the Forces which Mould Them
Forfatter: F. R. S., A. R. S. M., C. V. Boys
År: 1890
Serie: Romance of Science Series
Sted: London
Sider: 178
UDK: 532
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THE FORCES WHICH MOULD THEM. 69
almost parallel (Fig. 30), and the shape of the
shadow will have become a curve, known as a
parabola; and now when the candlestick is
still more tilted, so that the grease misses the
Fig. 3°-
base altogether and falls in a gentle stream
upon the carpet, you will see that the sides of
the shadow have curled round and met on the
wall, and you now have a curve like an oval,
except that the two ends are alike, and this is